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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Sep. 30, 2018
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure | [1] |  |  | $ 5,479,000,000
Commodity Transactions |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure | [2] |  |  | 2,196,000,000
Nuclear Obligations |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure | [3] |  |  | 200,000,000
Cove Point |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure | [4] |  |  | 1,900,000,000
Financial Guarantee [Member] | Equity Method Investee [Member] |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  |  | 48,000,000
Financial Guarantee [Member] | Affiliated Entity |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  |  | 4,000,000
Financial Guarantee [Member] | Affiliated Entity | Minimum |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum annual future contributions |  |  |  | 4,000,000
Financial Guarantee [Member] | Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Facility Limit |  |  | $ 3,400,000,000 |
Revolving credit facility stated maturity date |  |  | Oct. 31, 2021 |
Maximum potential loss exposure, limited guarantee percentage |  |  | 48.00% |
Guarantee liability |  |  |  | 23,000,000
Guarantee recorded amount |  |  |  | 1,000,000,000
Financial Guarantee [Member] | Subsequent Event | Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Additional amount borrowed |  | $ 132,000,000 |  |
Solar |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure | [5] |  |  | 640,000,000
Other |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure | [6] |  |  | 543,000,000
Surety Bond [Member] |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  |  | 169,000,000
Surety Bond [Member] | Virginia Electric and Power Company |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  |  | 70,000,000
Surety Bond [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  |  | 26,000,000
Financial Standby Letter of Credit [Member] |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  |  | $ 132,000,000
[1] | Excludes Dominion Energy's guarantee for the construction of a new corporate office property as discussed in Note 22 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2017.
[2] | Guarantees related to commodity commitments of certain subsidiaries. These guarantees were provided to counterparties in order to facilitate physical and financial transaction-related commodities and services.
[3] | Guarantees related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[4] | Guarantees related to Cove Point, in support of terminal services, transportation and construction.
[5] | Includes guarantees to facilitate the development of solar projects. Also includes guarantees entered into by DGI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects.
[6] | Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. Also included are guarantees related to certain DGI subsidiaries’ obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of September 30, 2018, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $4 million through 2019 and its maximum annual future contribution is approximately $4 million.

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- Definition Guarantee obligation. + References No definition available. + Details
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- Definition Guarantee obligations maximum potential loss exposure guarantee limited percentage. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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